There are many reasons for pus on the vulva, which can be seen in vulvar folliculitis or vulvar boils, and should also be considered as vestibulitis and other diseases. 1. Vulvar folliculitis: when the skin of vulva is damaged due to friction or local impurity, bacteria invade the hair follicles and their sebaceous glands, which can cause suppurative infection, redness, swelling and pain around the mouth of the hair follicle, white pus head can be seen, with hair in the center, and the head of the pus head can gradually increase to become a pustule. 2. Vulvar boils: can be seen in vulvar skin friction damage, moisture and sweating, also can be seen in chronic nephritis, diabetes mellitus, etc., caused by staphylococcus aureus or white staphylococcus infection, the skin around the mouth of the follicle is congested, swollen, painful and can gradually form a hard nodule, and then the center of the boils become soft and fluctuating with yellowish-white dots appearing in the central tip. 3. Vestibular adenitis: due to the special anatomical position of the vestibular gland, pathogens can invade under sexual intercourse and cause vestibular adenitis. At first, white dots with tenderness can be formed at the opening of the vestibular gland, and the opening is occluded, so the purulent secretion can’t be discharged, and vestibular adenomatous abscesses are gradually formed, and the lumps can be detected in the vulva. There may be other reasons for pus on the vulva, so it is recommended to go to the hospital in time, complete the relevant examinations, and get a clear picture of the cause of the disease under the guidance of a professional doctor, so as to provide targeted treatment.